Macedonians were noted in this document, “1930 Census: Enumerator Instructions“.
177. Principal foreign languages.-Following is a list of the principal languages which are likely to be reported as the mother tongue or native language of foreign-born persons:
.
.
.
Lettish
Lithuanian
Little Russian
Macedonian
Magyar
.
.
.
See http://usa.ipums.org/usa/voliii/inst1930.shtml